vEGKKIlD.T,. — .i;(;EItIA. 139 



^geria differs from all the foregoing insocts hy the union of its 

 transparent wings, slender antennte and hody ; and partic-idariy 

 from Trocliilium by the latter characters, added to the elongation 

 of its rnaxilUe, comparatively larger head, di^ aricating palpi, scaly 

 clypeus, and clothed apex to the wings; in manners they are essen- 

 tially different, the imago being remarkably vivacions and active, 

 being per])etnally in motion, and flying with the greatest rapidity, 

 alighting upon flowers, from which they derive their nourishment, 

 or basking upon leaves in the blaze of the sun, and continually 

 moving some part of their bodies. 



As in most genera of any extent, there is considerable diversity 

 of appearance in the contents of this: I shall therefore divide it 

 into sections. 



A. Antennic much shorter than the body : of the males distinctly pectinated : 

 anterior wings nearly clothed with scales: abdomen robust. 



Sp. 1. Asiliformis. A/is anticis J'uscis, posiicis hi/alinis, ulnhnninc nigra cingulis 

 tribusflavis, antennis nigris. (Exp. alar. 11 lin. — 1 unc. 3 lin.) 



Le. Asiliformis. Fubricius. — Sp. Asiliformis. Dun. xi. j>l. 381-.— iEg. Asili- 

 formis. Sieph. Catal. 



Bluish-black: head with a white spot before the eyes; collar yellow: palpi with 

 the base black, the apex yellow : antenna' cyaneous, beneath fulvous at the 

 base: male with the tip reddish : thorax with a spot at the base of the wings, 

 and a line on each side, yellow : abdomen glossy, with three yellow belts above 

 yellow ; caudal tuft black, with two longitudinal yellow streaks: femora black, 

 the posterior yellow at the base : tibia; yellow, with a black spot externally : 

 tarsi fulvous : anterior wings above fuscous, with the ni.Tvurcs and costa bluish ; 

 beneath pale tawny, with an indistinct central tawny lunule; posterior trans- 

 parent, with a discoidal lunule; the nervures and margin fuscous: fringe of 

 all the wings ashy-brown. IVIaJe differs in having the antenna; very strongly 

 pectinated nearly to the apex, the abdomen with four yellow belts, and in being 

 considerably smaller. 



Occasionally taken on })oplars near London in June. I have ob- 

 tained it from the neighbourhood of IJexiey and from Birch-wood; 

 but it is doubtless a rare species, and exists in i'cw collections: of 

 the male I have hitherto seen but two specimens, one of which I 

 possess, " Colney-hatch ^^'ood, an Umbcllifera*, 8th July last."— 

 Mr. higpen. 



B. Antenna; as long as the body; of ,tlic males generally ciliated: anterior 

 wings with the disc hyaline. 



a. Abdomen more or less robust ami (Mrcvialal,Jascialal uit/i whitish or ;/fllou. 



